Parker Digiplan Stepper Drive, Help Wanted

Dear All,

I am having trouble with an old Parker PKS Digiplan Stepper Motor
Driver, Model CD20. There is a fault on the main board causing one of
the output H switches to overheat.

Parker were not very helpful in that they do not make wiring diagrams
available to anyone, not even for this 20 year old unit.

Does anybody have additional faultfinding documents for this unit (I
do have the user manual, which is useless for this purpose).

Alternatively, does anyone have such a drive going spare? Or even an
alternative unit? Must be step/direction input, 3 Amps per phase, and
be able to handle a 64 Volts motor supply.

Any help appreciated.

Kind regards,
Thomas.